He Wanted To Make Sure The Water Had Enough Protien

This is why I bring bottled water and have my own coffee machine in my office. You just never know.

Dont think its real... Those containers have rather sharp edges and large openings.

So to conclude either one of the three were going on.

A.) He was really fucking the container (that would surely make for a bloody cock)

B.) He was merely jacking off into the container (thrusting is a natural orgasmic motion) notice the need for his arms to be close to the body.

C.) This was completly fake and made to be a joke for sickos like us.

I vote B!

Now that I watched it again,you may be right,tossing off in the water!!!